Gage for svsetal sheets



(ING Model.) H 2 Sheets-Sheet 1. H. 8v H. B. CHESS.

i GAGE FOR yMETAL SHEETS.

,frauen/2%?" @ff H.

(No Model.) .2` Sheets-Sheet 2.

H. av H.1B. CHESS.

GAGE EUR METAL SHEETS.

No.89,503j Patentedne. 4;, 1883.

UNITED STATES 'PATENT OFFICE.

HENRY AND HARVEY B. CHESS, OF PITTSBURG, PENNSYLVANIA.

GAGE FOR METAL SHEETS.

SPECIFICATION forming part of Letters Patent No. 289,503, dated December 4, 1883.

Application filed November 52,1883. (No model.)

section through x x of Fig. 2. I

Our invention relates to gages for gaging and determining the thickness of metal plates of all kinds; and it consists of the combination of devices hereinafter described and claimed.

To enable others skilled in the art to make and use our invention, we will proceed to describe the exact mannerin which we have carried it out. Y

It is well known that in gaging sheet metals the notched gages now in common `use are very unsatisfactory from various causes, and

among them wear in use without means for correcting or readjustiug them, inability to reach but a limited distance beyond the edge, which is frequently thickened from rolling double/a7 or from being pulled or drawn into a iin on one side of the plate, which necessarily prevents the plate from entering the notch, while the usual micrometer-scale is ditcult in its readings from the necessary neness of its scale when applied over such obstructions as we have mentioned. These readings must be made while in position, (since to remove it from its position opens up and destroys the reading,), and especially for large plates this reading in position is difficult and oftentimes almost impraeticable. Our gage is designed to overcome these difficulties by not only reaching out over these thickened edges and giving quick and easy readings, but also by` giving quick comparative readings.

The scale Aisdivided into Stubs standard and any subdivisions, or into decimal parts,

or both. rIhe bifurcated standard'B supports the scale A, to which it is rigidly attached, as shown in Fig. 2. This standard is provided with the iixed slotted jaw C, which carries on its outer end the curved spring C, bearing up against the flat thumb-piece of the movable jaw D, thus closing the jaws by an equal press-` ure at all times. The jaw D is attached to the iixed jaw C by means of the leg E passing through the slot in the jaw, where it is secured by the pivotal screws F. The lower end of the leg E is pivoted to a short bar, Cr, which inturn is pivoted to the lower portion of index-finger H at the bend h, the indeX-nger itself being pivoted at the foot of the standard B, all as illustrated in Figs. 1 and 2. One of the essential objects gained by this construction is to secure a comparatively large range of the index-linger H over the scale A by` a very slight change in the position of the jaws C and D. The jaw D may be adjusted by the screw d, so as to avoid au unnecessary amount of play in the movement of the jaw.

It is evident that the spring C may be so changed as to cause the jaws to open, allowing them to be closed by the pressure of the hand;

but this construction is objectionable, as the' hand-pressure would be unequal and inconstant, and the readings would necessarily be imperfect, while with the spring-pressure to close the jaws the pressure is necessarily uniform and the reading correct. All the screws are made to center and to compensate for wear In a gage for metal sheets, the scale A, standard B, and jaws C D, in combination with the spring C, leg E, bar G, and index-finger H, all constructed to operate substantially as and for the purpose specified.

HENRY CHESS. HARVEY B. CHESS.

Witnesses:

WM. N. EASTON, THoMAs J. RoeERs. 

